MapInfo and GPS

Some refinements:Amplified external antenna (Titan 3 - $70)http://www.gpsoutfitters.com/Titan3.html - for much better reception of weak signalsLaptop Sunshade ($40 - http://www.hoodmanusa.com/E2000A_New.asp)Differential Correction for better accuracy (~1-3m): * real-time RTCM-104 via Coast Guard broadcast (easy, but requires a Differential Beacon Receiver ($200-$500)

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